Odense University Hospital - Quality of Life Research Center, VU University Amsterdam, VU University Amsterdam, Erasmus University Rotterdam (EUR) - Clinical Trial Center, South Elvsborg Hospital, University of Copenhagen - Rigshospitalet, Maastricht University, Medical Center, Department of Hematology, Albert Schweitzer Hospital - Department of Internal Medicine, Erasmus University Rotterdam (EUR) - Cancer Institute, Lund University - Skane University Hospital, Martini Ziekenhuis, Tergooi Hospital, Isala Zwolle, Vejle Hospital, Meander Medical Center - Department of Hematology, Forde Central Hospital, Northwest Clinics, Maasstad Hospital, Jeroen Bosch Hospital - Department of Hematology, University of Stavanger - Stavanger University Hospital, Zaans Medisch Centrum, University of Copenhagen - Rigshospitalet, VU University Amsterdam - Department of Hematology, Erasmus University Rotterdam (EUR) - Department of Hematology, Norwegian University of Science and Technology (NTNU), Odense University Hospital and VU University Amsterdam - Department of Hematology